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The wide-area measurement system (WAMS) consists of the future power system,increasing geographical sprawl which is linked by the Phasor measurementunit(PMU). Thus, the failure of PMU will cause severe results, such as ablackout of the power system. In this paper, the reliability model of PMU isconsidered both hardware and software, where it gives a characteristic ofcorrelated failure of hardware and software. Markov process is applied to modelPMU, and reliability parameters are given by using symmetrical triangularmembership for Type-1 fuzzy reliability analysis. The paper gives insightfulresults revealing the effective approach for analyzing the reliability of PMU,under a circumstance which lack of sufficient field data.

Reliability Evaluation of Phasor Measurement Unit Considering Failure of Hardware and Software Using Fuzzy Approach